REVIEW 16 cited by
Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Signed reviews
read the original abstract
A black hole casts a shadow as an optical appearance because of its strong gravitational field. We study how to determine the spin parameter and the inclination angle by observing the apparent shape of the shadow, which is distorted mainly by those two parameters. Defining some observables characterizing the apparent shape (its radius and distortion parameter), we find that the spin parameter and inclination angle of a Kerr black hole can be determined by the observation. This technique is also extended to the case of a Kerr naked singularity.
Forward citations
Cited by 16 Pith papers
-
Determining Kerr black hole spin and inclination from a segment of the critical curve in black hole images
Three observables on a standardized segment of the Kerr critical curve uniquely fix spin a/M, inclination i, and segment location r_nl within the considered domain.
-
Constitutive birefringence and critical curves in the rotating Garc\'ia--D\'iaz black hole
In the rotating García-Díaz NLED black hole the Fresnel quartic factorizes into two optical metrics whose critical families project to distinct contours Γ+ and Γ- whose angular separation is generated by the constitut...
-
Strong-deflection expansion of the deflection angle near a degenerate photon sphere
Derives a factorized leading term for the strong deflection angle near degenerate photon spheres using local expansion of the effective potential and Weyl tensor measures.
-
Rotating Black Holes with Primary Scalar Hair: Shadow Signatures in Beyond Horndeski Gravity
Rotating black holes with primary scalar hair in beyond Horndeski gravity produce shadows whose diameter increases for negative Q and whose distortion increases for positive Q, with EHT bounds on M87* restricting but ...
-
Topological charge and black hole photon spheres in massive gravity
In dRGT massive gravity, static spherically symmetric black holes exhibit zero, one, or two photon spheres whose topological charges and stability patterns differ from Einstein gravity and from horizonless compact objects.
-
Dark matter environments and safeguards for spacetime inference from horizon scale interferometry
Using public 2017 M87* closure data, a frozen Kerr source fails an absolute adequacy test and the differential tidal-charge response fails numerical convergence, so no posterior or bound is reported.
-
A Universal Framework for Horizon-Scale Tests of Gravity with Black Hole Shadows
An adaptive ray-tracing and MCMC framework estimates shadow observables for arbitrary stationary metrics; applied to the Kerr–Bertotti–Robinson spacetime it yields an Sgr A* horizon-scale magnetic field of about 93 G ...
-
Optical Characteristics of the Kerr-Bertotti-Robinson Black Hole
For the Kerr-Bertotti-Robinson black hole, the magnetic field mainly enlarges the shadow and Einstein ring while rotation mainly distorts the shadow shape, and current M87* and Sgr A* data give only weak bounds on the field.
-
Influence of Observer Inclination and Spacetime Structure on Photon Ring Observables
For Johannsen-Psaltis spacetimes, the polar photon-ring time delay depends only on spin and shadow size, while the azimuthal shift probes the metric ratio F/N, enabling future spin and frame-dragging tests.
-
Determining parameters of Kerr-Newman black holes by shadow observation from finite distance and spatial infinity
The shadow contour of a Kerr-Newman black hole observed at infinity uniquely fixes (a/M, Q/M, i), while finite-distance shadows are degenerate for zero spin.
-
Influence of Perfect Fluid Dark Matter on Shadow Observables of Yang-Mills modified charged black holes
A rotating Yang-Mills charged black hole surrounded by perfect fluid dark matter is shown to have a smaller and more distorted shadow as the dark matter parameter increases, with EHT-derived bounds on the dark matter ...
-
Thermodynamics and Shadows of Kerr black holes endowed with a global monopole charge
The authors derive shadow and thermodynamic quantities for a Kerr-like metric with a global monopole term in Δ, and claim EHT observations constrain the monopole charge α.
-
Shadows and accretion disk images of charged rotating black hole in modified gravity theory
Ray-traced images of the Kerr-Newman-MOG black hole show that the MOG parameter α enlarges and rounds the shadow, and its effect beats that of the electric charge Q.
-
Shadows of rotating black holes in effective quantum gravity
For two covariant effective quantum gravity black holes, the quantum parameter ζ shrinks the shadow at moderate spin and creates a cuspy shadow edge near extremality.
-
Effect of gravitational wave on shadow of a Schwarzschild black hole
Numerical ray tracing shows that a first-order gravitational perturbation makes a Schwarzschild black hole shadow oscillate, stretch, and develop self-similar fractal boundary structures over time.
-
Deflection Angle of Regular Black Holes in Nonlinear Electrodynamics: Gauss-Bonnet Theorem, Time Delay, Shadow, and Greybody Bound
For a singularity-free charged black hole from nonlinear electrodynamics, this paper computes weak-field deflection angles (vacuum and plasma), time delay, shadow radius, and greybody bounds, finding charge reduces an...
Discussion (0). Continue with ORCID to comment.